/Engine/Source/Runtime/Experimental/Voronoi/Public/Voronoi/Voronoi.h
Distance to the nearest Voronoi site, or InvalidValue if outside of bounds
double DistanceToClosest ( const FVector & Sample, [FVoronoiComputeHelper](API\Runtime\Voronoi\Voronoi\FVoronoiComputeHelper) & ComputeHelper, double InvalidValue )